55445594561 has 16 divisors (see below), whose sum is σ = 63748405248. Its totient is φ = 47238681600.

The previous prime is 55445594543. The next prime is 55445594563. The reversal of 55445594561 is 16549554455.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55445594561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55445594563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1750481 + ... + 1781873.

It is an arithmetic number, because the mean of its divisors is an integer number (3984275328).

Almost surely, 2^55445594561 is an apocalyptic number.

It is an amenable number.

55445594561 is a deficient number, since it is larger than the sum of its proper divisors (8302810687).

55445594561 is a wasteful number, since it uses less digits than its factorization.

55445594561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32912.

The product of its digits is 10800000, while the sum is 53.

The spelling of 55445594561 in words is "fifty-five billion, four hundred forty-five million, five hundred ninety-four thousand, five hundred sixty-one".